Anne Schilling

  1. Demazure crystals, Kirillov-Reshetikhin crystals, and the energy function.

    Authors: Anne Schilling, Peter Tingley
    Subjects: Quantum Algebra
    Abstract

    It has previously been shown that, at least for non-exceptional Kac-Moody Lie
    algebras, there is a close connection between Demazure crystals and tensor
    products of Kirillov-Reshetikhin crystals. In particular, certain Demazure
    crystals are isomorphic as classical crystals to tensor products of
    Kirillov-Reshetikhin crystals via a canonically chosen isomorphism. Here we
    show that this isomorphism intertwines the natural affine grading on Demazure
    crystals with a combinatorially defined energy function.

  2. The biHecke monoid of a finite Coxeter group.

    Authors: Anne Schilling, Florent Hivert, Nicolas M. Thiéry
    Subjects: Combinatorics
    Abstract

    The usual combinatorial model for the 0-Hecke algebra of the symmetric group
    is to consider the algebra (or monoid) generated by the bubble sort operators.
    This construction generalizes to any finite Coxeter group W. The authors
    previously introduced the Hecke group algebra, constructed as the algebra
    generated simultaneously by the bubble sort and antisort operators, and
    described its representation theory.

  3. Affine structures and a tableau model for E_6 crystals.

    Authors: Anne Schilling, Brant Jones
    Subjects: Combinatorics
    Abstract

    We provide the unique affine crystal structure for type E_6^{(1)}
    Kirillov-Reshetikhin crystals corresponding to the multiples of fundamental
    weights s Lambda_1, s Lambda_2, and s Lambda_6 for all s \geq 1 (in Bourbaki's
    labeling of the Dynkin nodes, where 2 is the adjoint node). Our methods
    introduce a generalized tableaux model for classical highest weight crystals of
    type E and use the order three automorphism of the affine E_6^{(1)} Dynkin
    diagram.

  4. Affine structures and a tableau model for E_6 crystals.

    Authors: Anne Schilling, Brant Jones
    Subjects: Combinatorics
    Abstract

    We provide the unique affine crystal structure for type E_6^{(1)}
    Kirillov-Reshetikhin crystals corresponding to the multiples of fundamental
    weights s Lambda_1, s Lambda_2, and s Lambda_6 for all s \geq 1 (in Bourbaki's
    labeling of the Dynkin nodes, where 2 is the adjoint node). Our methods
    introduce a generalized tableaux model for classical highest weight crystals of
    type E and use the order three automorphism of the affine E_6^{(1)} Dynkin
    diagram.

  5. K-theory Schubert calculus of the affine Grassmannian.

    Authors: Anne Schilling, Thomas Lam, Mark Shimozono
    Subjects: Combinatorics
    Abstract

    We construct the Schubert basis of the torus-equivariant K-homology of the
    affine Grassmannian of a simple algebraic group G, using the K-theoretic
    NilHecke ring of Kostant and Kumar. This is the K-theoretic analogue of a
    construction of Peterson in equivariant homology.

  6. K-theory Schubert calculus of the affine Grassmannian.

    Authors: Anne Schilling, Thomas Lam, Mark Shimozono
    Subjects: Combinatorics
    Abstract

    We construct the Schubert basis of the torus-equivariant K-homology of the
    affine Grassmannian of a simple algebraic group G, using the K-theoretic
    NilHecke ring of Kostant and Kumar. This is the K-theoretic analogue of a
    construction of Peterson in equivariant homology.

  7. Promotion operator on rigged configurations of type A.

    Authors: Anne Schilling, Qiang Wang
    Subjects: Combinatorics
    Abstract

    Recently, the analogue of the promotion operator on crystals of type A under
    a generalization of the bijection of Kerov, Kirillov and Reshetikhin between
    crystals (or Littlewood--Richardson tableaux) and rigged configurations was
    proposed. In this paper, we give a proof of this conjecture. This shows in
    particular that the bijection between tensor products of type A_n^{(1)}
    crystals and (unrestricted) rigged configurations is an affine crystal
    isomorphism.

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